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Applicability of the Arrhenius model for Ammonia Oxidizing Bacteria subjected to temperature time gradients |
Alberto MANNUCCI1,*(),Giulio MUNZ1,Gualtiero MORI2,Claudio LUBELLO1,Jan A. OLESZKIEWICZ3 |
1. Department of Civil and Environmental Engineering, University of Florence, Florence 50139, Italy 2. Consorzio Cuoiodepur, Pisa 56020, Italy 3. Department of Civil Engineering, University of Manitoba, Winnipeg R3T 5V6, Canada |
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Abstract The aim of this work is to identify the range of applicability of Arrhenius type temperature dependence for Ammonia Oxidizing Bacteria (AOB) subjected to temperature time gradients through continuous titrimetric tests. An innovative online differential titrimetric technique was used to continuously monitor the maximum biologic ammonia oxidation rate of the biomass selected in a pilot scale membrane bioreactor, as a function of temperature time gradients. The monitoring technique is based on the measurement of alkalinity and hydrogen peroxide consumption rates in two parallel reactors operated in non-limiting substrate conditions for AOB; both reactors were continuously fed with mixed liquor and in one of them AOB were inhibited with allylthiourea. The effects of temperature decrease rates in the range 1 to 4°C·h−1 were evaluated by controlling the titrimetric reactor in the temperature range 10°C–20°C. The dependence of growth kinetics on temperature time gradients and the range of applicability of Arrhenius model for temperature dependency of AOB growth kinetics were assessed. The Arrhenius model was found to be accurate only with temperature gradients lower than 2°C·h−1. The estimated Arrhenius coefficients (θ) were shown to increase from 1.07 to 1.6 when the temperature decrease rate reached 4°C·h−1.
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Keywords
nitrification rate
temperature effect
continuous titrimetric tests
time-gradient temperature variations
Ammonia Oxidizing Bacteria (AOB)
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Corresponding Author(s):
Alberto MANNUCCI
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Online First Date: 11 August 2014
Issue Date: 23 November 2015
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